Today, Kelly and Mark will be participating in the Storytime Stage, where they'll read to kids, as will John Lithgow and Geena Davis.

The 30,000 lucky children attending from all 50 states who won via a lottery system will also be treated to performances from Willow Smith and Greyson Chance.

Just don't expect to eat tons of chocolate bunnies at this bash. This year's theme is "Get Up and Go!" and will promote fitness and wellness as part of the first lady's Let's Move campaign to raise healthier kids.